So now, we're all starting to have some success in fixing this problem. BUT. I think we need to separate the issues.
First of all. My problem is similar to every post in this thread in the sense that my PC shuts itself off, and needs to be resetted att the power supply to turn back on. The only difference for me is, that I don't even see the boot screen. My computer shuts down a few secs before monitor the automatic monitor turn-on. And here's the thing: it does so randomly.
Sometimes it works perfectly, for as many days in a row as I'd like, and other times I have to plug-unplug 7 times to get it going. Or 3 times. It all varies, and has been doing so for the past six months. It actually worked flawlessly for a couple of weeks. This rules out the CPU heating problem (inconsistency?), but i'm absolutely clueless.
Same problem here, it was shut down probably during the nite. When I turned it on
the next morning, it automatically shuts off. Sometimes I don't see the bio, or once I get
to the Windows SAFE mode page it shuts off. The more time I let it sit, the further I get, but never logon to Windows. The shorter time I give it, it shuts down randomly. I can't even let
it run in safe mode. How do we fix this?